Circulatory System

2. blood cells guard against infection, fight parasites, and attack bacteria
4. Node spreads an electrical impulse through the network of muscle fibers, causing the atria to contract
7. circulation left side of the heart pumping oxygen-rich blood to the rest of the body
10. sudden death of brain cells when their blood supply is interrupted
13. node picks up the impulse from the SA node, produces impulses that spread through the ventricles, causing them to contract
14. another name for the SA node
16. system transports oxygen and nutrients throughout the body while also removing wastes from tissues
18. nodes act as filters by trapping microorganisms and cancer cells
20. blood clotting is made possible by these
21. contractions of this pump blood throughout the circulatory system
22. circulation right side of the heart pumping oxygen-poor blood from the heart to the lungs

1. upper chamber, receives blood from the body
3. disease leading cause of death in the united states
5. system network of vessels and organs that collects lymph, checks it for microorganisms, and returns it to the circulatory system
6. 55% of total blood volume, a straw-colored liquid, mainly composed of water
8. large vessels that carry blood from the heart to the tissues of the body, most carry oxygen-rich blood
9. blood returns to the heart through these after going through the capillaries
11. lower chamber, pumps blood out of the heart
12. smallest blood vessels, allows oxygen and nutrients to diffuse from blood to tissues
15. carries oxygen-rich blood from the left ventricle
17. pressure when the heart contracts, it produces this wave of fluid pressure in the arteries
19. where red blood cells get their color from
23. blood cells the most numerous cells in blood, transports oxygen